646110445 has 4 divisors (see below), whose sum is σ = 775332540. Its totient is φ = 516888352.

The previous prime is 646110419. The next prime is 646110467. The reversal of 646110445 is 544011646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544011646 = 2 ⋅272005823.

It can be written as a sum of positive squares in 2 ways, for example, as 237221604 + 408888841 = 15402^2 + 20221^2 .

It is a cyclic number.

It is not a de Polignac number, because 646110445 - 2¹³ = 646102253 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64611040 + ... + 64611049.

It is an arithmetic number, because the mean of its divisors is an integer number (193833135).

Almost surely, 2^646110445 is an apocalyptic number.

It is an amenable number.

646110445 is a deficient number, since it is larger than the sum of its proper divisors (129222095).

646110445 is a wasteful number, since it uses less digits than its factorization.

646110445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129222094.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 646110445 is about 25418.7026616230. The cubic root of 646110445 is about 864.5078091375.

The spelling of 646110445 in words is "six hundred forty-six million, one hundred ten thousand, four hundred forty-five".